Heat insulation



May 6, 1930. E, SCHMIDT ET Al.

HEAT INSULATION Filed Feb. 25, 1928 Heruj Eduardy Patented May 6, 1930PATENT OFFICE ERNST SCHMIDT, F

DANTZIG-LANGFUHR, A ND EDUABD DYCKERHOFF, OF SCHLOSS IBLUMENAU, NEARWUNSTORF, GERMANY HEAT INSULATION Application med February 25,

This invention'relates to the thermal insulation described in thespecification of our (2o-pending application Serial No. 105,753 filed30th April, 1926, and has for its object 5 an improvement in ormodication of the same.

The thermal insulation described in our co-pending application consistsin surrounding the object to be insulated with a numberl0 of air spacesbounded by sheets of thin bright metal foil. The sheets of foil mayeither be supported on suitable spacing or distance pieces or may beemployed as a loose filling for subdividing air chambers for thermalinsulating purposes. In the latterv case the loss of heat at the pointsof contact throughout the loose filling is very small as the sheets,being very thin and in contact with one another at comparativel fewpoints, only permit a vry restricted ow of heat by conduction.

In order to render the insulation cheaper and also improve theinsulating properties of the sheets, the latter are preferably selectedas thin as possible, even as thin as the thinnest tissue paperobtainable. The thinness of the sheets renders the insulatingconstruction of sheets of relatively low rigidity. A construction ofgreater rigidity could be formed by employing thicker sheets, but oneobject of the present invention is to obtain greater rigidity in a moreeconomical manner.

According to the present invention a carrier of any suitable materialprovided with abright coating or layer for reflecting radiation, isemployed in place O the thin bright metal foil employed in our`co-pending application. The layer or coating may be metallic and a verythin coating or layer may be applied by spraying a metallic mass uponthe carrier or by galvanic action. Known insulating materials such aspaper, cork, asbestos, pea-t and the like may h ere be inen- -tioned asbeing suitable materials for the carrier, but it is not absolutelyessential to 'utilize any insulating material or'the carrier, aninsulating material being. however 5o preferable for this purpose, asthe thermal 1928, Serial No. 257,099, and in Germany July 3, 1926.

insulating properties of the insulating material thus formed are therebyimproved.

The present invention permits the employment of continuous, that is tosay unbroken, bounding surfaces as the coated material can be madeeconomically in relatively large sheets, whereas thin bright foil canonly be manufactured in an economic manner in relatively small sheets.Moreover the cost of the coating or layer provided on the carrier is sosmall on account of the thinness of the coating or layer that it isimmaterial from the point of view of expense, what coating material isemployed. The material from which the coating is formed should howeverbe one which will not readily become dull and lose its reiect-ingproperties and thus permit loss of heat by radiation through theinsulation.

The coating or layer may be applied to the carrier either before orduring the construction of the insulation.

An embodiment of the invention is illustrated in the accompanyingdrawing, in which,

Fig. 1 is an elevation of a length of pipe insulated in accordance withthe invention;

Fig. 2 is an end view of Fig. 1; Y

Fig. 3 is a perspective of a fragment of insulating sheet;

F ig. 4 is a view similar to Fig. 1 in which the insulating sheets arecrumpled, and

Fig. 5 is an end view of the same.

The insulating sheets consist of a backing 1, pf paper or the like,having abright met-allic coating 2, deposited thereon, as by spraying.In Fig. 1, the pipe 10 has spacin rings 11 placed around it atintervals, sai rings supporting one of the insulating sheets 1, 2. InFigs. 4 and 5, the pipe lO has a sheet or sheets of insulation,previously crumpled, wound around it, and an outer sheathing 12, ofsheet metal, asbestos, or other suitable inaterial enclosing said sheetsand supported from the pipe b the spiders 13.

Having now escribed our invention, what we claim as new and desire tosecure by Letters Patent, is

1. Heat insulation for an object, consisting 100 of a sheet of paper orthe like, having a bright metallic coating deposited thereon and adaptedto enclose the object so as to leave an air space between it and saidsheet.

2. Heat insulation, comprising a plurality of thin supporting sheets,having a bright metallic coating deposited thereon and adapted tosurround said object, air spaces being left between the latter and theinner sheet and between each pair of adjacent sheets.

-3. Means for preventing the radiation, convection and conduction ofheat from a body, consisting of non-metallic material, a bright metalliccoating deposited thereon and adapted to surround said object so as toform a plurality of air chambers.

4. Means for preventin the radiation, convection and conduction 0% heatfrom a body, consisting of sheets of insulating material with brightmetallic coatings deposited thereon, said sheets being adapted to be soplaced around said body as to leave air spaces between it and the innersheet and between each pair of adjacentsheets.

In testimony whereof we have hereunto set our hands.

ERNST SCHMIDT. EDUARD DYCKERHOFF.

having'

